Delete row sig_a45153899159 from signals

id sig_a45153899159
event_id evt_5e100556805b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T12:15:05.928103+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:e8fa2b9fc5ba49bf
throttle_s 0
created_at 2026-04-22T12:15:05.928103+00:00
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